Upgrade driveshafts with diff?
Upgrade driveshafts with diff?
09-08-2018, 03:53 PM
#1
Thanks
On a W114/5 when changing a rear diff for more power, Ie lowering the ratio, are the original W114 driveshafts up to the job (300-350bhp) or should others be used? If so, from the various diffs that are compatible (W116, W123, early W126) do any of the driveshaft lengths match? Or do they have to be made?
Thanks
09-08-2018, 08:03 PM
#2
I'm just going to go the full way and get a one piece driveshaft built for my ~200hp build
1978 300D, 373,000km... OM617.912 with a Holset HX30W, 7.5mm IP, 711.113 5 speed (project car, 7 years off the road and counting ;/)
1977 250 270,000km (parts car)
1977 300D (ex 280) 500,000km
1981 240D 498,000
1975 HJ45 ???,000
2001 2.8TD Rodeo 4x2 - 456,000 - DD
It's moreso the flex discs that are the weak link. V8 driveline would be the way to go (110mm discs vs 90mm?)
I'm just going to go the full way and get a one piece driveshaft built for my ~200hp build
1978 300D, 373,000km... OM617.912 with a Holset HX30W, 7.5mm IP, 711.113 5 speed (project car, 7 years off the road and counting ;/)
1977 250 270,000km (parts car)
1977 300D (ex 280) 500,000km
1981 240D 498,000
1975 HJ45 ???,000
2001 2.8TD Rodeo 4x2 - 456,000 - DD
09-09-2018, 05:33 PM
#3
(09-08-2018, 08:03 PM)NZScott It's moreso the flex discs that are the weak link. V8 driveline would be the way to go (110mm discs vs 90mm?)
I'm just going to go the full way and get a one piece driveshaft built for my ~200hp build
Thanks.
I should have said I'll increase the flex disc diameter, possibly get whole prop of something like a 560SEC and shorten/lengthen to suit. I just wondered whether the driveshafts were weak. I presume they would be narrower on a W114/5
(09-08-2018, 08:03 PM)NZScott It's moreso the flex discs that are the weak link. V8 driveline would be the way to go (110mm discs vs 90mm?)
I'm just going to go the full way and get a one piece driveshaft built for my ~200hp build
Thanks.
I should have said I'll increase the flex disc diameter, possibly get whole prop of something like a 560SEC and shorten/lengthen to suit. I just wondered whether the driveshafts were weak. I presume they would be narrower on a W114/5
09-09-2018, 11:56 PM
#4
1978 300D, 373,000km... OM617.912 with a Holset HX30W, 7.5mm IP, 711.113 5 speed (project car, 7 years off the road and counting ;/)
1977 250 270,000km (parts car)
1977 300D (ex 280) 500,000km
1981 240D 498,000
1975 HJ45 ???,000
2001 2.8TD Rodeo 4x2 - 456,000 - DD
Oops sorry. Didn't realise you meant the half-shafts....that I cannot help with and might learn something myself
1978 300D, 373,000km... OM617.912 with a Holset HX30W, 7.5mm IP, 711.113 5 speed (project car, 7 years off the road and counting ;/)
1977 250 270,000km (parts car)
1977 300D (ex 280) 500,000km
1981 240D 498,000
1975 HJ45 ???,000
2001 2.8TD Rodeo 4x2 - 456,000 - DD
10-19-2018, 10:44 AM
#5
(09-09-2018, 05:33 PM)madmog(09-08-2018, 08:03 PM)NZScott It's moreso the flex discs that are the weak link. V8 driveline would be the way to go (110mm discs vs 90mm?)
I'm just going to go the full way and get a one piece driveshaft built for my ~200hp build
Thanks.
I should have said I'll increase the flex disc diameter, possibly get whole prop of something like a 560SEC and shorten/lengthen to suit. I just wondered whether the driveshafts were weak. I presume they would be narrower on a W114/5
.065 tube ish or the metric equivalent. they actual shaft is probably good for 4-500ftlbs tho the slip spline is pretty small. the flex disks are the rowdy part tho. then getting everything to align once you go soild vs rubber>
benz force sells pucks that can take a u joint flange. i i were to do it all over again i would just throw away the mercedes stuff buy those have tom woods make a shaft and run u joints.
85 300d om603, 717, he 341, sch40 stainless manifold with prioritized 50mm external W/G (2"open dump), intercooled, intake manifold, full 3.5 stainless exhaust.
need to figure out a different trans cause its already pissed with only 5.5mm elements... then diff and suspension. but for now its daily as described above.
(09-09-2018, 05:33 PM)madmog(09-08-2018, 08:03 PM)NZScott It's moreso the flex discs that are the weak link. V8 driveline would be the way to go (110mm discs vs 90mm?)
I'm just going to go the full way and get a one piece driveshaft built for my ~200hp build
Thanks.
I should have said I'll increase the flex disc diameter, possibly get whole prop of something like a 560SEC and shorten/lengthen to suit. I just wondered whether the driveshafts were weak. I presume they would be narrower on a W114/5
.065 tube ish or the metric equivalent. they actual shaft is probably good for 4-500ftlbs tho the slip spline is pretty small. the flex disks are the rowdy part tho. then getting everything to align once you go soild vs rubber>
benz force sells pucks that can take a u joint flange. i i were to do it all over again i would just throw away the mercedes stuff buy those have tom woods make a shaft and run u joints.
85 300d om603, 717, he 341, sch40 stainless manifold with prioritized 50mm external W/G (2"open dump), intercooled, intake manifold, full 3.5 stainless exhaust.
need to figure out a different trans cause its already pissed with only 5.5mm elements... then diff and suspension. but for now its daily as described above.
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